Sometimes when we upload photos on some websites, there will be a pixel size requirement for the comparison photos on the website. If the original photos do not meet this requirement, we have to modify the size of them. Generally, we may think of using professional software like PS to modify the size. You can easily do this with the Preview software that comes with the Mac.
Double-click the photo to be modified, it will be opened with “Preview” by default, click “Tools” in the menu, and then click “Modify Size”;
Then modify the parameters as needed.
Alternatively, you can crop a photo by dragging the mouse over the photo if the proportions are not right (press ESC to exit cropping, determine the cropping area and hit Enter to finish cropping, or command-z to undo cropping).
Mac preview is actually quite powerful, there are a lot of useful features, more Mac preview utility ➡️ mac.orsoon